Deepak Juyal1, Benu Dhawan2, Vijay Thawani3, Shweta Thaledi4. 1. Department of Microbiology, Government Doon Medical College, Dehrakhas, Patelnagar, Dehradun, Uttarakhand, India. 2. Department of Microbiology, All India Institute of Medical Sciences, New Delhi, India. 3. Department of Pharmacology, People's College of Medical Sciences and Research Centre, Bhapur, Bhopal, Madhya Pradesh, India. 4. Department of Microbiology, Sridev Suman Subharti Medical College, Subhartipuram, Prem Nagar, Dehradun, Uttarakhand, India.